Hello, I am male and 28 years old and I am suffering from a weird tingling (tickling) sensation-pain on the left side of my rib cage. More precisely on the coastal cartilage in the area that attaches to the sternum. I feel this tingling sensation even while sleeping. It also seems that sleeping on the back strengthens the tickling sensation. Any kind of body pull-ups also make the "pain" stronger to a point where I have pinch like sensations during sleep. I am physically active and leading a healthy lifestyle. I even tried to give up weightlifting but the pain is still there. Any advice and comment on what this is will be welcome. Thanks for your replies.